[all-commits] [llvm/llvm-project] d7b0e5: X86: fix frame offset calculation with mandatory t...

[Tim Northover via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d7b0e5525a4e809cf61a4e1c82f000af781cbab4
      https://github.com/llvm/llvm-project/commit/d7b0e5525a4e809cf61a4e1c82f000af781cbab4
  Author: Tim Northover <t.p.northover at gmail.com>
  Date:   2021-08-04 (Wed, 04 Aug 2021)

  Changed paths:
    M llvm/lib/Target/X86/X86FrameLowering.cpp

  Log Message:
  -----------
  X86: fix frame offset calculation with mandatory tail calls

If there's a region of the stack reserved for potential tail call arguments
(only the case when we guarantee tail calls will be honoured), this is right
next to the incoming stored return address, not necessarily next to the
callee-saved area, so combining the two into a single figure leads to incorrect
offsets in some edge cases.